已知抛物线
与x轴的负、正半轴分别交于A,B两点,与y轴的负半轴交于点D点C是抛物线的顶点.
(1)若
,求该抛物线的对称轴;
(2)在(1)的条件下,连接AD,CD,若
,求该抛物线的解析式;
(3)若
,点D的坐标为
,请判断点C是否存在最高点或最低点,若存在,求该点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5bd57912b194186fb5cbe63ed24861.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cf64a6d2e4e816ff540beeecf8c331d.png)
(2)在(1)的条件下,连接AD,CD,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af21bb000b6110ef1deea3635f6d0376.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f6a9e845bfe11b80ad41dbdbda857f9.png)
21-22九年级上·广东广州·期末 查看更多[3]
更新时间:2022-02-18 14:32:08
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相似题推荐
解答题-问答题
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较难
(0.4)
解题方法
【推荐1】如图,点
,
分别在
轴和
轴的正半轴上,
,
的长分别为
的两个根
,点
在
轴的负半轴上,且
,连接
.
,
,
三点的抛物线的函数解析式;
(2)点
从点
出发,以每秒2个单位长度的速度沿
运动到点
,点
从点
出发,以每秒1个单位长度的速度沿
运动到点
,连接
,当点
到达点
时,点
停止运动,求
的最大值;
(3)
是抛物线上一点,是否存在点
,使得
?若存在,请求出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24fdf96560fb2b54a6d40b2e57a8ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e80567a8bffedd15979f1102ae07a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19cbf4a0b81b41ba29296e3ea58e1e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4345a6472d09aca011e8126cffb56e5.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ba8c4b5d7874536108708b634b6fbb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐2】已知抛物线
过点
,交x轴于A,B两点(点A在点B左侧),交y轴于点C,且对于任意实数m,恒有
成立.
(1)求抛物线的解析式.
(2)作直线BC,点是直线BC上一点,将点E向右平移2个单位长度得到点F,连接EF.若线段EF与抛物线只有1个交点,求点E横坐标的取值范围,
(3)若
,
,
三点都在抛物线上且总有
,直接写出n的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae889c838900f855351e387339307ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd18a5a4bb929ec3dabb8d114f7fd8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/198d0081301c59dfd60ac3570a02d22c.png)
(1)求抛物线的解析式.
(2)作直线BC,点是直线BC上一点,将点E向右平移2个单位长度得到点F,连接EF.若线段EF与抛物线只有1个交点,求点E横坐标的取值范围,
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61765bb45c7ebb259b3da6d9f6dd5093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92de6d77ad222616ff0f2868a86d2daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00e7cd23b1eac0b439545470c8cfc33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4557a97a17857a08aeb0a39489f10b.png)
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【推荐1】如图1,抛物线C1:y=ax2+bx+c与x轴交于A(﹣1,0),B(3,0)两点,且顶点为C,直线y=kx+2经过A,C两点.
![](https://img.xkw.com/dksih/QBM/2022/2/18/2918913672282112/2919002281361408/STEM/1d5c6202-980f-4e7f-ad5b-78f6f8ff9bf4.png?resizew=573)
(1)求直线AC的表达式与抛物线C1的表达式;
(2)如图2,将抛物线C1沿射线AC方向平移一定距离后,得到抛物线为C2,其顶点为D,抛物线C2与直线y=kx+2的另一交点为E,与x轴交于M,N两点(M点在N点右边),若S△MDE=
S△MAE,求点D的坐标;
(3)如图3,若抛物线C1向上平移4个单位得到抛物线C3,正方形GHST的顶点G,H在x轴上,顶点S,T在x轴上方的抛物线C3上,P(m,0)是射线GH上一动点,则正方形GHST的边长为 ,当m= 时,
有最小值 .
![](https://img.xkw.com/dksih/QBM/2022/2/18/2918913672282112/2919002281361408/STEM/1d5c6202-980f-4e7f-ad5b-78f6f8ff9bf4.png?resizew=573)
(1)求直线AC的表达式与抛物线C1的表达式;
(2)如图2,将抛物线C1沿射线AC方向平移一定距离后,得到抛物线为C2,其顶点为D,抛物线C2与直线y=kx+2的另一交点为E,与x轴交于M,N两点(M点在N点右边),若S△MDE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
(3)如图3,若抛物线C1向上平移4个单位得到抛物线C3,正方形GHST的顶点G,H在x轴上,顶点S,T在x轴上方的抛物线C3上,P(m,0)是射线GH上一动点,则正方形GHST的边长为 ,当m= 时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e771fad03e399361a7730c7d10225c.png)
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【推荐2】在平面直角坐标系
,
是抛物线
上任意两点,设抛物线的对称轴为直线
.
(1)若
,
,求
的值;
(2)若
,
,当
时,
,当
时,
,求
的值;
(3)若对于
,
,都有
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311a36f03fac6d979014e605e80913a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d046826b3840b908d823d90be499e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd69aebdafb31468eb13ce3b28a36e47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4223bd6ee8f82d59d244371fbcddc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7389956fef69001377e48f01af71af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/204e5160ff110a19878e4fae639319e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27dfd40d48b5297df3d3c1fddc431313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a79d7f73b6128650bf7aed538260c72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21a6817fd5ddc56f0295109a2be6ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ef88280301b355d6d68f08798d7b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)若对于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/951a1aedd0ef2913cf0a06b86573ce5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae2496865059425488e90e0bc7dddd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f99df1a7b58018125b99578b779342.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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名校
【推荐1】如图1,已知抛物线
经过
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/5ad28508-f1d4-4385-839c-9cf9200d4589.png?resizew=299)
(1)求抛物线的解析式;
(2)将直线
向下平移m个单位长度后,得到的直线与抛物线只有一个公共点D,求m的值及点D的坐标;
(3)如图2,若异于点A的点N在抛物线上,且
,求点N的坐标;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62df6feec0736be43171e25089d12677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26eff596e9e02e20c3e1b72ef3292fa6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/5ad28508-f1d4-4385-839c-9cf9200d4589.png?resizew=299)
(1)求抛物线的解析式;
(2)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(3)如图2,若异于点A的点N在抛物线上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e31d35479633b046c1bfc229c15b2be3.png)
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【推荐2】已知:抛物线y=-x2+2x+m-2交y轴于点A(0,2m-7).与直线y=
x交于点B、C(B在右、C在左).
(1)求抛物线的解析式;
(2)设抛物线的顶点为E,在抛物线的对称轴上是否存在一点F,使得
,若存在,求出点F的坐标,若不存在,说明理由;
(3)射线OC上有两个动点P、Q同时从原点出发,分别以每秒
个单位长度、每秒2
个单位长度的速度沿射线OC运动,以PQ为斜边在直线BC的上方作直角三角形PMQ(直角边分别平行于坐标轴),设运动时间为t秒,若△PMQ与抛物线y=-x2+2x+m-2有公共点,求t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(1)求抛物线的解析式;
(2)设抛物线的顶点为E,在抛物线的对称轴上是否存在一点F,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b667bcd36eed9fe9e3302eff7dd0b90.png)
(3)射线OC上有两个动点P、Q同时从原点出发,分别以每秒
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
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